. 在玻璃 ( 折射率 n 2 = 1.60) 表面镀一层 MgF 2 ( 折射率 n 2 = 1.38) 薄膜作为增透膜.为了使波长为 500 nm(1nm=10 9 m) 的光从空气 ( n 1 = 1.00) 正入射时尽可能少反射, MgF 2 薄膜的最少厚度应是
A.
78.1 nm
B.
90.6 nm
C.
125 nm
D.
181 nm
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